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叶片在气孔开度振荡过程中的水分平衡。

Leaf water balance during oscillation of stomatal aperture.

机构信息

Division of Irrigation Research, CSIRO, Griffith, N.S.W.

出版信息

Plant Physiol. 1969 Jun;44(6):826-30. doi: 10.1104/pp.44.6.826.

Abstract

Continuous transpiration and beta-guage measurements were made on cotton plants, the stomatal apertures of which had been induced to oscillate, thus allowing a water balance to be made, and leaf potential to be measured as functions of time.Analyses showed phase differences between the water entering and leaving the leaf. Also, from the phase relationship between the flow into the leaf and the water potential in the leaf it was shown that the water potential in the xylem of the plant also oscillated. This is proposed as a necessary condition for the stomates of all the leaves of a plant to oscillate in phase.It is convenient to describe the dynamics of the phenomena using a simple electrical analogue, and the usefulness and limitations of the model are discussed.

摘要

对棉花植株进行了连续蒸腾和β-量具测量,这些棉花植株的气孔已经被诱导发生了振荡,从而可以进行水分平衡,并且可以测量叶势作为时间的函数。分析表明,进入和离开叶片的水分之间存在相位差。此外,从进入叶片的流量和叶片中的水势之间的相位关系可以看出,植物木质部中的水势也在振荡。这被认为是植物所有叶片的气孔同步振荡的必要条件。使用简单的电气模拟来描述这些现象的动力学是很方便的,并且讨论了模型的有用性和局限性。

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